Review on Ferroday 1/2 NPT Stainless Steel Dial Thermometer for Homebrew Kettles with Lock Nut & O-Ring - Temperature Range 0-220ºF (-10-100ºC) by Jacob Mendoza

I bought this for my tank's automatic water changer, it's very accurate and sensitive and there is a switch on the back to set the temperature if it's not accurate enough Put the sensor in boiling water for about a minute and set the temperature to 100 degrees Celsius. The only reason I give 4 stars is that it takes a few minutes for the temp gauge to get back up, but overall it's cheap, good quality and works great!